Full day with iOS 7.1 on my Verizon iPhone 4S and I have to say I'm impressed. My stats consist of NO music playback, browsing on social networks, a phone call, iMessaging and taking and editing a few pictures. Wifi on and 3G is off. The only weird thing was a few hours ago my battery dropped from 12% to 6% while idle within about 30 minutes. Still, very impressive.
This is right after the phone cut back on

If you installed iOS 7 and restored from a backup, you should restore as new and resync all your apps manually. This is best done on your computer using iTunes. This helps ensure no problem files are brought over. It also helps get rid of the huge cache of old files you do not need. You will lose all data saved on the phone when you do this. Transfer pics and music to computer first. This is the best way to get a clean install, and worth the effort.

Always turn off wi-fi and bluetooth if you are not using them. Turn auto brightness on for the screen and make sure the timeout is 1 minute.

After using the settings below cycle your battery two times. That means let it die until it turns off on its own, and then charge to 100% without using it while it charges. This does NOT “train” the battery, but it calibrates the battery meter so you get a true measure of performance.

Use these settings for maximum battery life:

settings > notification > turn off notifications for all apps you do not truly need push alerts for.

settings > general > spotlight search > make sure nothing is selected. this archives and scans your hard drive with every change so it can index your data. this uses a lot of processing power.